Spa shell



FIG. 1 is a perspective view of a spa shell showing our design;

FIG. 2 is a perspective view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a cross-sectional view taken along line 4-4 of FIG. 3;

FIG. 5 is a cross-sectional view taken along line 5-5 of FIG. 3;

FIG. 6 is a cross-sectional view taken along line 6-6 of FIG. 3; and,

FIG. 7 is a cross-sectional view taken along line 7-7 of FIG. 3.

The broken lines in the drawings represent unclaimed portions of the spa shell and form no part thereof. 

CLAIM The ornamental design for a spa shell, as shown and described. 